Decagon WP4-T - 7. Taking Readings; Measurement Process and Cautions

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PotentiaMeter

Calibration and Verification Standards

6. At this screen, adjust the water potential value to

its proper value for the KCl solution at that tem-

perature (-2.19 MPa at 20 °C; -2.22 MPa at 25

°C). Press the upper right button to move the

value up, the lower right button to move it

down. When it is at the value you want, press

the Exit button. The value will be stored.

Note: This is the only menu where these buttons can

change the calibration, so you won’t hurt anything

by pressing these buttons in other menus.

7. Read the KCl standard again in the normal sam-

pling mode. It should read the proper value.

8. If after adjusting the calibration and cleaning the

chamber you still are getting incorrect readings

when reading the KCl, contact Decagon at 509

332-2756 (1-800-755-2751 in US and Canada) for

further instructions.